Hi Eric,

I'd like to help you out.
Check this out first:
http://www.samag.com/documents/s=1146/sam0109j/0109j.htm

And maybe contact me offline and I will see what I can do.

Miles


----------------------------------------------------------------------------------------------
Miles Purdy 
System Manager
Information Systems Team (IST),
Farm Income Programs Directorate (FIPD),
Agriculture and Agri-Food Canada (AAFC) 
6th Floor 200 Graham Ave.           Mailing: PO box 6100
Winnipeg, MB, CA                                     R3C 4N3
R3C 4L5
Office contact:                                            Mobile contact:
 purdym AT fipd.gc DOT ca                                      purdym AT 
rogers.blackberry DOT net         
 ph: (204) 984-1602 fax: (204) 983-7557        Cell: (204) 291-8758

"If you hold a UNIX shell up to your ear, can you hear the C?"
-------------------------------------------------------------------------------------------------

>>> Eric-van.Loon AT KLM DOT COM 02-Feb-05 10:39:19 AM >>>
Hi *SM-ers!
We are currently struggling with our SSA disk performance.
For some strange reason we see that although all disks use LVM mirroring,
the reads are not balanced. In most case one disk is used for 60 or 70%
while it's mirror is just using 3%.
We also measured the disks performance. We created a file on a raw logical
volume and measured around 15 Mbytes/sec. We created a JFS filesystem on the
same disks and reran the test: 40 Mbytes/sec. I cannot explain this
difference! RAW should perform better that JFS on AIX 4.3.3, right?
Today we upgraded AIX to the latest maintenance level (11) and installed the
latest firmware on the disks, but performance hasn't improved.
I was hoping that TSM-ers with AIX performance knowledge can help me out
here, I'm stuck right now...
Thank you VERY much in advance for any reply!!
Kindest regards,
Eric van Loon
KLM Royal Dutch Airlines


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